Hex #555987 or rgb(85,89,135) in RGB space is the tint of violet. It has hue angle of 235.20 degrees, value = 53 and saturation = 37. #555987 can be obtained by mixing 3 colors: 4 drops of red, 5 drops of blue, 3 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #555987 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555987 to the mixer and play with it.